This document presents the results of developments of control strategies and control algorithms for power-electronic systems of the drivetrain with the involvement of four use cases (UC1, UC3, UC4, UC5, and UC6) using the current Wide bandgap (WBG) devices.
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The main objective of WP3 is to optimize the architecture and the controllers for power-electronic systems in the drivetrain of electric vehicles (EVs). Within WP3, Task 3.2.1 “Assessment of control algorithm for electronic systems with WBG technologies” has actively started in M10 (February 2019) and will be finished in M30 (December 2020) of the project.
Task 3.2.1 goal is to develop the control strategies and control algorithms for power electronic systems such as inverters (linked to UC3 and UC4), On-board chargers (linked to UC5), Off-board chargers (linked to UC6), and testing systems (linked to UC1). The input of this task is the deliverable D1.1 “Specification for inverters, chargers, and test systems”, the deliverable D1.2 “Requirements and Evaluation criteria”, and the deliverable D3.1 “Design optimization of switching technologies”. The outputs of this task are the deliverable D3.3 and D3.12 (an update on the control systems after integrating the new WBG devices). The outcome of this deliverable will be used in WP5 for the early verification.
For each use-case (from UC1 to UC6), the robust control strategies and control algorithms have been developed for the power-electronic systems such as interleaved converters, inverters and dual-inverters, on-board charger and off-board charger. A brief summary of all activities for each use case are highlighted below:
• The partners involved in UC1 have developed a model predictive control (MPC) that can foresee and consider the future implications of the current control action. The development of model predictive control was applied for the test system containing a DC/AC converter with an inductor machine.
• In UC3a and UC3b, control algorithms are developed to control a three-phase inverter for a permanent magnet synchronous motor (PMSM). Software-in-the-loop tests are performed, and the code will be implemented in a low-level multicore microcontroller for hardware-in-the-loop (HiL) testing.
• UC4 focuses on developing the torque control, torque vectoring and multiphase motor control for the dual inverter architecture. The torque control algorithms were developed for the control of the two in-wheel e-motors to improve the performance at the vehicle in terms of efficiency and longitudinal and lateral dynamic behavior. Additionally, safety monitoring functions were implemented at powertrain level.
• In the framework of UC5, the involved partners have worked together on defining constant-current (CC) and constant-voltage (CV) charging profiles for the on-board charger. Four control loops have been designed to meet requirements of power factors, total harmonic, current ripple, voltage ripple, and response time during the charging process. Simulation results were shown to verify the performances of the designed controllers. They proved that all of the requirements of the controllers were met for different load conditions.
• For UC6, a high-level charging strategy and low-level control algorithms have been developed. The development of the high-level charging strategy focuses on a real-time scheduling and optimization algorithm. Meanwhile, the development of low-level control algorithms focuses on bidirectional power transfer and local voltage support.